Get Lineup

2026-05-19 — opportunistic persona backfill.

Returns the activity's lineup enriched with entities (personas):

1. If activity_lineup rows exist, use them.
2. Else if activities.lineup JSON has entries, materialise activity_lineup rows from the JSON (auto-backfill).
3. For each row, resolve the artist_name to an entities row via services/persona_resolver.resolve_persona. Unmatched names create placeholder entities so the persona has a profile from day one — claimable before the owner shows up.

The first time someone visits an activity, the personas seed. From then on the lookup is cheap. By the time the actual owner finds ActivitIA, the persona profile already has appearances, claimable status, and a slug.